A unique botanical garden housed in three giant geodesic domes.

The bugs crawling down the front of this office building are almost as big as a '68 VW Beetle.

A place to eat for on-the-run agents and espionage enthusiasts.

Statue dedicated to the star of an old television show.

One of Frank Lloyd Wright's final works was this UFO church.

This foreboding building was the headquarters of the terrifying Spanish Inquisition in Mexico.

A disquieting Aztec sculpture displays hundreds of stone skulls representing the victims of human sacrifice.

These spectacular, symbolic serpents lie within the shadow of the Great Temple.

Part bookstore, part café, and part forest.

66,000 pieces of art, donated by one of the world's richest men.

The only castle in North America to ever house European sovereigns.

Brain collection and database that narrows the gap between man and animal.

The "lost friend” is the most famous of the six moai statues that were removed from Easter Island.

This Hungarian castle was built out of cardboard and wood until it proved so popular that it got upgraded to stone.

No telescopes, no power, no gift shop: The Observatory of Chichen Itza, one of the world's oldest observatories, takes astronomy back to basics.

A series of waterfalls and pools that flow through the 'Ohe'o Gulch and into the ocean.

The only royal palace on U.S. soil has been a territorial capitol, a military headquarters, and a prison for a queen.

The preamble to the U.S. Constitution written entirely from vanity license plates hangs in the Smithsonian museum.

The site of William McKinley's tragic assassination is only marked by an underwhelming boulder.

The absurd creation is a compulsory destination for selfies in Buffalo.

A castle built for love, and abandoned due to heartbreak.

This tiny little island has, as the name says, just enough room for its single house.

340-foot statue built to honour the Heroes of the Soviet Union.

A reconstructed medieval gateway that was the magnificent entrance to the capital city dating back to 1037.